golang cpu_gccgo_x86 代码
文件路径：/src/vendor/golang.org/x/sys/cpu/cpu_gccgo_x86.go
/ Copyright 2018 The Go Authors. All rights reserved.
/ Use of this source code is governed by a BSD-style
/ license that can be found in the LICENSE file.
/go:build (386 || amd64 || amd64p32) && gccgo
/ +build 386 amd64 amd64p32
/ +build gccgo
package cpu
/extern gccgoGetCpuidCount
func gccgoGetCpuidCount(eaxArg, ecxArg uint32, eax, ebx, ecx, edx *uint32)
func cpuid(eaxArg, ecxArg uint32) (eax, ebx, ecx, edx uint32) {
var a, b, c, d uint32
gccgoGetCpuidCount(eaxArg, ecxArg, &a, &b, &c, &d)
return a, b, c, d
}
/extern gccgoXgetbv
func gccgoXgetbv(eax, edx *uint32)
func xgetbv() (eax, edx uint32) {
var a, d uint32
gccgoXgetbv(&a, &d)
return a, d
}
/ gccgo doesn't build on Darwin, per:
/ https://github.com/Homebrew/homebrew-core/blob/HEAD/Formula/gcc.rb#L76
func darwinSupportsAVX512() bool {
return false
}